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1, 7, 56, 318, 1408, 5207, 16772, 48410, 127661, 312172, 715827, 1552945, 3210066, 6359208, 12131129, 22374522, 40034564, 69695820, 118346132, 196435550, 319321325, 509215461, 797775355, 1229513719, 1866237409
(list; graph; refs; listen; history; internal format)
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